Transmission Filter Kits

Doc's Diesel Transmission Filter Kits

Protect the Parts You Can't See.

Your transmission filter has one job, and it's a big one: catching the clutch material, metal particles, and debris that circulate through every automatic transmission before they reach the parts that can't survive them—the torque converter, the fluid pump, the valve body. When the filter loads up, the transmission runs hotter, works harder, and wears faster; you feel it as sluggish shifts long before you see it on a repair bill. Doc's Diesel Transmission Filter Kits are built to keep your rig shifting the way it should—premium filtration that pulls contaminants out of the fluid, cuts heat, reduces wear, and takes strain off your engine for better fuel mileage in the bargain.

Everything the Filter Side of the Job Needs.

Each kit includes the transmission filter with premium filter media, the pan, and a gasket made from premium NBR rubber—the same material OE manufacturers trust for hot, oil-soaked sealing duty. The gasket comes with fitted screw holes, so it lines up on reinstallation instead of fighting you, and the whole kit drops in without modification. This is the right collection if you're sourcing your own fluid or your fluid is still in service—and if you'd rather get the filter kit and the correct ATF together in one box, our Transmission Service Kits bundle both.

Built to OEM Specs. Backed by the Doc's Fitment Guarantee.

Every Doc's transmission filter kit is engineered to meet or exceed OEM design, fit, and function—media that filters to spec, pans that seal, gaskets that don't weep after the first heat cycle. Deep inside your drivetrain is the last place to find out a bargain part doesn't fit, which is why every kit is covered by our Fitment Guarantee: if it doesn't fit your truck, we'll make it right. No guesswork. No BS.

Doc's Makes It Easy to Stay on Schedule.

Find your exact kit with our Vehicle Selection Tool—enter your year, make, and model, and we'll show you the filter kit matched to your transmission. Then plan the interval: change your transmission filter every 25,000 to 50,000 miles, or 60,000 miles maximum. Keep in mind that OEM recommendations assume regular driving, not hauling—if your truck tows or carries heavy loads, Doc's recommends changing earlier than the book says. A loaded transmission runs hotter, and hot fluid breaks down faster than any schedule accounts for.

Free Shipping on All U.S. Orders $99+

A transmission filter kit is one of the cheapest line items in your maintenance budget, protecting one of the most expensive components in your truck. Pair it with fluid, add it to a filter order, or stock one for the next service—every order over $99 ships free anywhere in the U.S. Catch the debris before it catches up with you. That's the Doc's way.